I'm just new in this PCL libraries, I'm developing an iPhone app with Xamarin and I can't find the way to save it on the phone. The closest I get is with PCLStorage but he only saves text.
There is another way that I can save binary files with other procedure.
Thank you.
foreach (images element in json_object)
{
//var nameFile = Path.Combine (directoryname, element.name);
try{
IFile file = await folder_new.GetFileAsync(element.name);
}catch(FileNotFoundException ex ){
RestClient _Client = new RestClient(element.root);
RestRequest request_file = new RestRequest("/images/{FileName}");
request_file.AddParameter("FileName", element.name, ParameterType.UrlSegment);
_Client.ExecuteAsync<MemoryStream>(
request_file,
async Response =>
{
if (Response != null)
{
IFolder rootFolder_new = FileSystem.Current.LocalStorage;
IFile file_new = await rootFolder_new.CreateFileAsync(element.name,CreationCollisionOption.ReplaceExisting);
await file_new.WriteAllTextAsync(Response.Data);
}
});
}
}
Use the IFile.OpenAsync method to get a stream which you can use to read/write binary data. Here's how you would read a file:
IFile file = await folder_new.GetFileAsync(element.name);
using (Stream stream = await file.OpenAsync(FileAccess.Read))
{
// Read stream and process binary data from it...
}
Related
I am using Microsoft Graph SDK to upload file in chunks in OneDrive. I am using below code to upload the file:
try
{
GraphServiceClient graphClient = this.GetGraphServiceClient(accessToken);
string fileName = Path.GetFileName(srcFilePath);
using (var fileContentStream = System.IO.File.Open(srcFilePath, System.IO.FileMode.Open))
{
var uploadSession = await graphClient.Me.Drive.Root.ItemWithPath(fileName).CreateUploadSession().Request().PostAsync();
var maxChunkSize = 5 * 1024 * 1024;
var provider = new ChunkedUploadProvider(uploadSession, graphClient, fileContentStream, maxChunkSize);
var chunkRequests = provider.GetUploadChunkRequests();
var readBuffer = new byte[maxChunkSize];
var trackedExceptions = new List<Exception>();
Microsoft.Graph.DriveItem itemResult = null;
foreach (var request in chunkRequests)
{
var result = await provider.GetChunkRequestResponseAsync(request, readBuffer, trackedExceptions);
if (result.UploadSucceeded)
{
itemResult = result.ItemResponse;
}
}
}
}
catch (Microsoft.Graph.ServiceException e)
{
}
catch (Exception ex)
{
}
The above code works fine with normal file names. However, when I am trying to upload a file with name as Test#123.pdf, "Object reference not set to an object" exception is thrown at line var provider = new ChunkedUploadProvider(uploadSession, graphClient, fileContentStream, maxChunkSize); Please see below screenshot:
Is this a limitation of OneDrive SDK, or am I not passing the parameters correctly?
The # sign has a special meaning in a URL. Before you can use it, you'll need to URL Encode the file name: Test%23123.pdf.
I am new to Xamarin iOS, i need to download multiple videos at same time. how should i achieve this ? is there any class which can help me download similar to the DownloadManager in Android.
You can try this approaches
public void getData(List<String> urls) {
// define the HttpClient
var handler = new HttpClientHandler { AllowAutoRedirect=false };
var client = new HttpClient(handler);
// define file path
var path=Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
// start download
System.Threading.Tasks.Parallel.ForEach(urls, async (url) => {
var uri = new Uri(url);
var fileName = System.IO.Path.GetFileName(uri.LocalPath);
// download the file
var data = await client.GetByteArrayAsync(uri);
// save file on disk
System.IO.File.WriteAllBytes(System.IO.Path.Combine(path, fileName), data);
});
}
I have an asp.net MVC application, below code works file.
But the code is that, When navigate to Email action in browser, an EML file is download, then when we click on that file, the file will open with outlook.
Can it be possible, when action calls, then EML file will directly open with outlook, instead of download and then click to open??
Code
public async Task<FileStreamResult> Email()
{
string dummyEmail = "test#localhost.com";
var mailMessage = new MailMessage();
mailMessage.From = new MailAddress(dummyEmail);
mailMessage.To.Add("dejan.caric#gmail.com");
mailMessage.Subject = "Test subject";
mailMessage.Body = "Test body";
// mark as draft
mailMessage.Headers.Add("X-Unsent", "1");
// download image and save it as attachment
using (var httpClient = new HttpClient())
{
var imageStream = await httpClient.GetStreamAsync(new Uri("http://dcaric.com/favicon.ico"));
mailMessage.Attachments.Add(new Attachment(imageStream, "favicon.ico"));
}
var stream = new MemoryStream();
ToEmlStream(mailMessage, stream, dummyEmail);
stream.Position = 0;
return File(stream, "message/rfc822", "test_email.eml");
}
private void ToEmlStream(MailMessage msg, Stream str, string dummyEmail)
{
using (var client = new SmtpClient())
{
var id = Guid.NewGuid();
var tempFolder = Path.Combine(Path.GetTempPath(), Assembly.GetExecutingAssembly().GetName().Name);
tempFolder = Path.Combine(tempFolder, "MailMessageToEMLTemp");
// create a temp folder to hold just this .eml file so that we can find it easily.
tempFolder = Path.Combine(tempFolder, id.ToString());
if (!Directory.Exists(tempFolder))
{
Directory.CreateDirectory(tempFolder);
}
client.UseDefaultCredentials = true;
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = tempFolder;
client.Send(msg);
// tempFolder should contain 1 eml file
var filePath = Directory.GetFiles(tempFolder).Single();
// create new file and remove all lines that start with 'X-Sender:' or 'From:'
string newFile = Path.Combine(tempFolder, "modified.eml");
using (var sr = new StreamReader(filePath))
{
using (var sw = new StreamWriter(newFile))
{
string line;
while ((line = sr.ReadLine()) != null)
{
if (!line.StartsWith("X-Sender:") &&
!line.StartsWith("From:") &&
// dummy email which is used if receiver address is empty
!line.StartsWith("X-Receiver: " + dummyEmail) &&
// dummy email which is used if receiver address is empty
!line.StartsWith("To: " + dummyEmail))
{
sw.WriteLine(line);
}
}
}
}
// stream out the contents
using (var fs = new FileStream(newFile, FileMode.Open))
{
fs.CopyTo(str);
}
}
}
With Chrome you can make it automatically open certain files, once they are downloaded.
.EML should attempt to open in Outlook.
I am not sure about other browsers, but Chrome seemed to be the only one with this option.
It's not a pefect solution because if someone downloaded an .EML from another website in Chrome, it will open automatically aswell.
I recommend having Chrome dedicated to your Web application.
You sure can open local .eml file with Outlook.
But in context of web application, you must firstly download it.
I'm trying to write a WebApi service that receives a file, does a trivial manipulation, and sends the file back. I'm having issues on sending and/or receiving the file from the service.
The issue I'm having is that the file returned from the service is ~1.5x larger than the manipulated file, e.g. when the file is returned it's like 300kb instead of the 200kb it should be.
I assume its being wrapped and or manipulated somehow, and I'm unsure of how to receive it properly. The code for the WebAPI service and the method that calls the web service are included below
In, the WebApi service, when I hit the line return Ok(bufferResult), the file is a byte[253312]
In the method that calls the web service, after the file is manipulated and returned, following the line var content = stream.Result;, the stream has a length of 337754 bytes.
Web API service code
public ConversionController: APIController{
public async Task<IHttpActionResult> TransformImage()
{
if (!Request.Content.IsMimeMultipartContent())
throw new Exception();
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
var file = provider.Contents.First();
var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
var buffer = await file.ReadAsByteArrayAsync();
var stream = new MemoryStream(buffer);
// [file manipulations omitted;]
// [the result is populated into a MemoryStream named response ]
//debug : save memory stream to disk to make sure tranformation is successfull
/*response.Position = 0;
path = #"C:\temp\file.ext";
using (var fileStream = System.IO.File.Create(path))
{
saveStream.CopyTo(fileStream);
}*/
var bufferResult = response.GetBuffer();
return Ok(bufferResult);
}
}
Method Calling the Service
public async Task<ActionResult> AsyncConvert()
{
var url = "http://localhost:49246/api/conversion/transformImage";
var filepath = "drive/file/path.ext";
HttpContent fileContent = new ByteArrayContent(System.IO.File.ReadAllBytes(filepath));
using (var client = new HttpClient())
{
using (var formData = new MultipartFormDataContent())
{
formData.Add(fileContent, "file", "fileName");
//call service
var response = client.PostAsync(url, formData).Result;
if (!response.IsSuccessStatusCode)
{
throw new Exception();
}
else
{
if (response.Content.GetType() != typeof(System.Net.Http.StreamContent))
throw new Exception();
var stream = response.Content.ReadAsStreamAsync();
var content = stream.Result;
var path = #"drive\completed\name.ext";
using (var fileStream = System.IO.File.Create(path))
{
content.CopyTo(fileStream);
}
}
}
}
return null;
}
I'm still new to streams and WebApi, so I may be missing something quite obvious. Why are the file streams different sizes? (eg. is it wrapped and how do I unwrap and/or receive the stream)
okay, to receive the file correctly, I needed to replace the line
var stream = response.Content.ReadAsStreamAsync();
with
var contents = await response.Content.ReadAsAsync<Byte[]>();
to provide the correct type for the binding
so, the later part of the methods that calls the service looks something like
var content = await response.Content.ReadAsAsync<Byte[]>();
var saveStream = new MemoryStream(content);
saveStream.Position = 0;
//Debug: save converted file to disk
/*
var path = #"drive\completed\name.ext";
using (var fileStream = System.IO.File.Create(path))
{
saveStream.CopyTo(fileStream);
}*/
I'm struggling with a easy problem. I want to download an image from web using this code:
WebRequest requestPic = WebRequest.Create(#"http://something.com/" + id + ".jpg");
WebResponse responsePic = await requestPic.GetResponseAsync();
Now I wanted to write the WebResponse's stream in a StorageFile (eg. create a file id.jpg in the app's storage), but I haven't found any way to achieve that. I searched the web for it, but no success - all ways incompatible Stream types and so on.
Could you please help?
I have found the following solution, which works and is not too complicated.
public async static Task<StorageFile> SaveAsync(
Uri fileUri,
StorageFolder folder,
string fileName)
{
var file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
var downloader = new BackgroundDownloader();
var download = downloader.CreateDownload(
fileUri,
file);
var res = await download.StartAsync();
return file;
}
You will need to read the response stream into a buffer then write the data to a StorageFile. THe following code shows an example:
var fStream = responsePic.GetResponseStream();
var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("testfile.txt");
using (var ostream = await file.OpenStreamForWriteAsync())
{
int count = 0;
do
{
var buffer = new byte[1024];
count = fStream.Read(buffer, 0, 1024);
await ostream.WriteAsync(buffer, 0, count);
}
while (fStream.CanRead && count > 0);
}
That can be done using the C++ REST SDK in Windows Store Apps. It's explained by HTTP Client Tutorial.